Results 21 to 30 of about 2,056 (161)
Shuitu Baochi Xuebao, 2022 为深入研究坡度与植被对坡面流水力学特性的影响,以Navier—Stokes方程为基础,建立了非淹没刚性植被坡面流模型,并对该模型进行验证。运用该模型,参考西南山区实际情况,设置6个坡度、6个单宽流量和6种覆盖度组合条件下共216种工况,研究了坡面流的水力学特性。结果表明:流速与坡度、流量及植被覆盖度之间呈指数变化,相关系数为0.987。相同流量下,随着坡度的增加,流速增速逐渐减小,植被对坡面流的减缓作用逐渐减弱。阻力系数受到坡度、流量和植被覆盖的影响,存在临界覆盖度,低于临界覆盖度时 ...
胡静 +4 more
doaj +2 more sources
Conservation Biology, Volume 37, Issue 1, February 2023., 2023 Abstract Insights into declines in ecosystem resilience and their causes and effects can inform preemptive action to avoid ecosystem collapse and loss of biodiversity, ecosystem services, and human well‐being. Empirical studies of ecosystem collapse are rare and hampered by ecosystem complexity, nonlinear and lagged responses, and interactions across ...
David A. Keith +8 more
wiley +1 more source
Characteristics of Erosive Rainfall and Its Effects on Runoff and Sediment Yield in a Low Mountain and Hilly Area of Lianyungang City [PDF]
, 2022 [Objective] The effects of different rainfall characteristics and different underlying surface conditions on soil erosion and sediment yield were determined in a low mountain and hilly area of Lianyungang City, Jiangsu Province, in order to provide a ...
Cheng Jianmin +3 more
core +1 more source
GIS-based Study of Ecological Water Requirement of Vegetation in Inner Mongolia Autonomous Region [PDF]
, 2023 [Objective] The ecological water requirement (EWR) of vegetation in different typical zones for the rational allocation of water resources in the Inner Mongolia Autonomous Region was analyzed and calculated to provide scientific suggestions for water ...
Ge Zheng +5 more
core +1 more source
Shuitu Baochi Xuebao, 2023 基于Eagleson的生态水文最优性理论,从区域尺度上,综合多种环境变量,模拟宁夏地区生态水文平衡状态下植被最优盖度,进而确定植被承载力,并研究在不过分消耗土壤水分的前提下不同植被类型的最优盖度。结果表明:(1)在研究期内(2000—2019年),基于Eagleson生态最优性理论得到的平衡植被覆盖度与实际植被覆盖度相关关系为0.86,模型模拟良好,除去农田,宁夏地区的多年平均植被盖度为0.048~0.984,模拟的平衡植被覆盖度为0.153~0.840,植被盖度在空间上具有较好的一致性,南部地区较高 ...
范德政 +5 more
doaj
Spatial-temporal Evolution and Influencing Factors of Dominant Marginalization of Cultivated Land in Guizhou Province Based on Land Use Change [PDF]
, 2023 [Objective] The spatial-temporal evolution pattern and influencing factors of the dominant marginalization of cultivated land in Guizhou Province from 2010 to 2020 were analyzed in order to provide policy guidance for the intensive use of cultivated land
Feng Yingbin, Yang Xiyuan
core +1 more source
Soil Erosion and Spatio-temporal Variations in Huangshui River Basin Based on MODIS and Landsat Data [PDF]
, 2022 [Objective] The spatio-temporal distribution and variation characteristics of soil erosion in the Huangshui River basin in the upstream region of the Yellow River were analyzed in order to provide basic data and a basis for decision-making in relation to
Ding Yuanyuan +7 more
core +1 more source
Shuitu Baochi Xuebao, 2023 为探究气候和植被覆盖度变化对三峡库区消落带库岸边坡的影响,通过开展人工模拟降雨试验,分析不同雨强和植被覆盖度(0,30%,50%,70%,90%)下坡面侵蚀规律及变化特征。结果表明:(1)在不同雨强下,植被边坡侵蚀累计产沙量均随植被覆盖度的增加呈现下降趋势,整体下降演变的趋势可分为迅猛—平缓—稳定3个阶段,三峡库区消落带库岸边坡的临界盖度为50%~70%,维持植被覆盖度在此区间可以有效抑制坡面的泥沙损失。(2)同一植被覆盖度条件下地表径流相对系数与雨强呈正相关 ...
王瑞红 +6 more
doaj
Shuitu Baochi Xuebao, 2023 为了分析植被覆盖对黄土高原坡面水土流失的影响,量化土壤侵蚀的植被覆盖阈值,基于模拟降雨数据分析了植被覆盖对土壤侵蚀的作用机制,利用绥德、西峰、天水等黄土高原高原典型地区的野外径流小区定位观测资料,探讨了不同覆被类型下植被覆盖控制径流和土壤侵蚀的有效性,确定了不同覆被类型下植被覆盖调控径流和防治土壤侵蚀的植被覆盖下限阈值和上限阈值。结果表明:(1)植被覆盖度的提高增加了土壤入渗、减少了径流量、延缓了径流流速、增加了土壤抵抗侵蚀的能力。(2)坡面径流量随植被覆盖度呈幂函数或指数函数下降 ...
张龙齐 +5 more
doaj
Shuitu Baochi Xuebao, 2022 为了解退耕还林草工程实施20年来黄土高原生态脆弱区生态环境的变化及其主要驱动力,选取榆林市作为黄土高原生态环境脆弱区的代表,基于像元二分模型估算榆林市2001-2020年的植被覆盖度,利用一元线性回归法分析其20年来植被覆盖度的时空变化特征,并结合偏相关分析和地理探测器法筛选退耕还林草不同时期影响榆林市植被覆盖度年际变化和空间分异的主导因素。结果表明:(1)2001-2020年榆林市植被覆盖度随时间序列呈显著增加趋势(S=0.011 ...
刘逸滨 +4 more
doaj